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Reference: support.microsoft.com/en-us/office/turn-off-focused-inbox-f714d94d-9e63-4217-9ccb-6cb2986aa1b2
For instructions with pictures, or other platforms (Mail for Windows 10, Outlook.com, classic Outlook on the web) see the link above.
Outlook 2016 (or newer) for Windows
- Select the View tab
- Select Show Focused Inbox
- Toggling this setting on and off will change your Outlook Inbox tabs to be either Focused/Other or All/Unread
Outlook on the web
- At the top of the page, select Settings (gear icon)
- In the Settings pane, move the Focused Inbox toggle to off
Outlook 2016 (or newer) for Mac
- Select the Organize tab
- Select Focused Inbox